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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77af7c83af7d804137fb60b7117b8df0a655a48c0cf722b0e365dadd758d1cd5' 
  AND token = 'hgsAso99OQUeWlUEk7c1n4pK6Yw4ahG7iS2Neikad4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}